esformat: fix obsolete video_palette_t documentation
the old text here has been obsolete since we stopped "blindly" copying between video_palette_t and ffmpeg/libavcodec's AVPaletteControl struct in 61146f7e.
the old text here has been obsolete since we stopped "blindly" copying between video_palette_t and ffmpeg/libavcodec's AVPaletteControl struct in 61146f7e.
VideoLAN code repository instance